Tool rotating mechanism



TooL ROTATING MEGHANISM Filed Nov. 8, 1940 2 Sheets-Sheet l Snventor Gtorneg Jan. 5, 1943. 1 A BQLLER 2,307,382

TOOL RoTTING MECHANISM l Filed Nov. v8, 1940` 2 Sheets-Sheet 2 FEE' noentor Jaun A.. BoLLER Ctttomeg Patented Jan. 5, 1943 TOOL ROTATIN G MECHANISM John A. Boller, Thurmont, Md., assignor to Landis Tool Company, Waynesboro, Pa.

Application November 8, 1940, Serial N o. 364,927

4 Claims.

This invention relates to a system of belt transmission for rotating tools, particularly grinding wheels.

An object of this invention is to provide a tool drive wherein the sole means for maintaining belt tension will be the weight of the driving member.

A further object is to provide means for adjusting the amount of tension in the driving belt.

Tool rotating drives of the type disclosed herein usually include one or more devices for maintaining belt tension such as tightener pulleys.

Applicant has eliminated tightener pulleys by mounting the jackshaft pivotally on the wheel support on a base which is adjustable in the direction of movement of said support.

The driving motor is also pivotally mounted on the bed. The tendency of the driving motor thru its connection to the jackshaft is to cause the jackshaft to rotate about its pivot in a clockwise direction. The connection from the jackshaft to the tool resists this movement and is thus placed in tension. The degree of tension depends on the angle of the jackshaft supporting arm. This may be adjusted by shifting the base on which the jackshaft is mounted.

Figure 1 is an end elevation of a machine showing the method of driving the cutting tool.

Figure 2 is a front elevation of a grinding wheel support.

Figure 3. is a plan view or" the jackshaft yassembly showing the means for adjusting same toward and away from the wheel spindle.

Figure 4 is a front elevation of the jackshaft mounting.

Numeral I indicates the bed of a machine, I I a tool support slidably, mounted thereon. A tool spindle I2 having a grinding wheel 40 mounted thereon is rotatably mounted in a housing I3 on said tool support. Spindle I2 has a pulley I4 thereon which is connected thru belt I5 to a pulley I6 on jackshaft I'I. A smaller pulley I 8 on said jackshaft is connected thru a belt I9 to pulley 20 of motor 2 I. Said motor is attached to a 'motor plate 22 which in turn is pivotally mounted on trunnions 23 in bearings 25.. Said bearings are formed in base plate 30 on bed I0.

Jackshaft I1 is supported in a bracket 25 on pivots 29. Said pivots are held securely in clamps 28 on base member 26. Said base member 2S is in turn adjustably mounted for movement in a horizontal direction on the tool support 2l by means of screws 35 passing thru slots 36 in said base member. The weight of the motor is trans mitted thru belt I9 and the jackshaft I'I to the belt I5 thus to maintain tension in said spindle driving belt I5. The proportion of the weight of the motor transmitted to belt I5 may be varied by adjusting the base member 26 toward or away from the tool spindle I2.

I claim:

l. In a metal working machine, a bed, a tool support slidably mounted thereon for movement toward and from operative position, a cutting tool rotatably mounted on said support, means for rotating said tool including a motor pivotally mounted on said bed, a jackshaft pivotally mounted on said tool support, and adjustable in a horizontal plane thereon, belts connecting said motor and jackshaft and said jackshait and cutting tool, said jackshaft being so pivoted that the weight of the motor provides tension on the tool driving belt, and means for shifting the jackshaft mounting so as to changethe proportion of motor weight transmitted to said spindle driving belt.

2. In a metal working machine, a bed, a tool support slidably mounted thereon for movement toward and from operative position, a cutting tool rotatably mounted on said support, a base member slidably mounted on said support for adjustment horizontally and transversely of the axis of rotation of said tool, means for rotating said tool including a motor pivotally mounted on said bed, a jackshaft pivotally mounted on said base member, belts connecting said motor and jackshaft and said jackshaft and cutting tool, said jackshaft being so pivoted that the weight of the motor provides tension on the tool driving belt.

3. In a metal working machine, a bed, a, tool support slidably mounted thereon for movement toward and from operative position, a cutting tool rotatably mounted on said support, means for rotating said tool including a motor movably mounted on said bed, a base member mounted for horizontal adjustment on said support, a second member mounted on said base member and free to move relative thereto at all times, a jackshaft mounted on said second member, and belt connections between said motor, said jackshaft, and said tool.

4. In a metal working machine, a bed, a tool support slidably mounted thereon for movement toward and from operative position, a cutting tool rotatably mounted on said support, means for rotating said tool including a driving member movably mounted on said bed, a base member mounted for horizontal adjustment on said support, a second member mounted on said base member and free to move relative thereto at all times, a jackshaft mounted on said second member, and belt connections between said driving member, said jackshaft, and said tool, adjustment of said base member being eiective to change the proportion of belt tension of said driving member transmitted to said tool driving connection.

JOHN A. BoLLER. 

